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To: Michael who wrote (5840)	1/28/2000 9:16:00 AM
From: RocketMan	Read Replies (3) \| Respond to of 13582

Thread, does anyone understand how the snaptrack comm architecture would fit in with the cellular stations? GPS transmits in L-band, is low power, and is easily blocked by buildings. To use it inside a building, the customer having to go outside to get a GPS fix. From the little reading I did, the cdma network would send a cue to the phone as to where it was, so that the gps software could do a faster fix on the best satellites. But it would still need to get that fix, and anyone using a gps receiver knows how easily the signal is blocked. A combination cell phone/gps would work well in vehicles, with an external antenna, or for an individual outside, but not so well inside a building. I mentioned in another post, though, that a cellular/gps network could easily provide differential gps, where the cell stations could transmit error correction for the gps signals. This compensates for the selective availability error put in by the military for security reasons.